Paper Information

Journal:   AMIRKABIR   Summer 2003 , Volume 14 , Number 55-E; Page(s) 948 To 961.
 
Paper: 

STATIC AND PSEUDO-STATIC BEARING CAPACITY ANALYSIS OF SHALLOW FOUNDATIONS BY DISCRETE ELEMENT METHOD (DEM)

 
 
Author(s):  MIRGHASEMI A.A., MAJIDI A.R.
 
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Abstract: 

Discrete Element Method (DEM) can be used for numerical analysis of different geotechnical problems such as slope stability bearing capacity of shallow foundation and relative displacement of rock masses. In this research an effort is made to use the method for determining bearing capacity of foundation. To do this a computer program called BCAP (Bearing Capacity Analysis Program) is developed In this model the foundation can rest on a horizontal or inclined slope surface. The bearing capacity of strip shallow foundation is analyzed by "DEM" in both static and pseudo-static conditions. The soil mass is modeled as several discrete blocks connected with Winkler springs. Similar to the conventional bearing capacity theories tire failure of footing occurs by a wedge of soil below the footing pushing its way downward into the soil. The geometry of the failure surface is not f red and can be altered due to the all factors affect the problem. The geometry of the failure surface under the foundation is determined by four independent angles. By the trial and error the optimum. Shape of failure surface beneath the foundation can be found this optimum failure surface is corresponds to the minimum-collapsing load. Dynamic seismic forces are replaced by horizontal acceleration factors in a semi-static manner affecting on foundation. The paper includes several examples to explain the capability of the method. Also the results are compared with the other methods currently used for ultimate bearing capacity of shallow foundations. Several graphs are presented expressing the bearing capacity's coefficients for foundation on horizontal and inclined surfaces in the conditions of static and pseudo-static forces for various internal friction of underneath soil.

 
Keyword(s): DISCRETE ELEMENT BEARING CAPACITY SHALLOW FOUNDATIONS, SLOPE SURFACE AND EARTHQUAKE
 
References: 
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